I'd add one anecdote: I went hiking on one of the Hawaiian volcanos a few years ago and got up close with some active (but extremely slow-moving) lava. Here's

I'd add one anecdote: I went hiking on one of the Hawaiian volcanos a few years ago and got up close with some active (but extremely slow-moving) lava. Here's a pic of me poking it with a stick: https://imgur.com/DuwuCg1 https://imgur.com/DuwuCg1 What amazed me was the absolute sheer about of heat generated from that one TINY little patch. Like, as intense as standing in front of a pizza oven going at full blast. I could stand about ~15 seconds of it once I exposed the molten part, and then I had to step away. Overall in the area it was warm - mostly because it was Hawaii and hot out! - but also because of general ambient warmth. But it was just that - warmth. But when I exposed that piece of molten lava - that was HEAT.